According to Fox press notes, "In 'Elementary School Musical,' the season premiere episode, Marge (Julie Kavner) sends Lisa (Yeardley Smith) to a performing arts camp where artsy counselors (guest voices Jemaine Clement and Bret McKenzie of 'Flight of the Conchords') and fellow musically inclined campers (guest voices Lea Michele, Cory Monteith and Amber Riley of 'Glee') inspire her to embrace her creative side. After she returns to Springfield, Lisa becomes restless with her ho-hum suburban lifestyle and catches the first bus to Sprooklyn in hopes of reconnecting with her inner hipster."

Daniel Radcliffe ("Harry Potter," Equus, How to Succeed…) and Hugh Laurie ("House") will be guest voices in the 21st annual "Treehouse of Horror" Halloween episode. Oscar and Olivier Award winner Rachel Weisz and Oscar winner Halle Berry, who reportedly may appear on Broadway this fall in The Mountaintop, will also appear as guest voices in future episodes, as will Tony winner Joe Mantegna (appearing again as Fat Tony), Jon Hamm of "Mad Men," Facebook creator Mark Zuckerberg, Martha Stewart, Kristin Wiig, Paul Rudd, Allison Hannigan and Cheech & Chong.